Exercise training performed by patients after Acute Coronary Disease (ACS) and revascularization, classified as low to moderate risk, is considered to be safe. The training program that will be used in this study has been evaluated in a similar population of elderly cardiac patients without any documented harmful effects. In order to reduce potential risks of exercise training all patients perform a maximal cardiopulmonary exercise test at baseline, excluding patients with myocardial ischaemia and ventricular arrhythmias during exercise. The first three training sessions will be under supervision of trained physiotherapist in a clinical setting. The patients will receive a heart rate monitor and accelerometer to use at home. These monitors are developed and optimized to cause minimal physical discomfort and are non-invasive. During the measurement periods, all patients are asked to wear the monitors continuously for 5 days and to note the physical activities performed. The HT group will use the HR monitors during their physical trainings as well.